Iris valve ring



FIG. 1 depicts a front isometric view of an iris valve ring design;

FIG. 2 depicts a bottom view of the design;

FIG. 3 depicts a top view of the design;

FIG. 4 depicts a front view of the design;

FIG. 5 depicts a back view of the design;

FIG. 6 depicts a left view of the design; and,

FIG. 7 depicts a right view of the design.

The ornamental design for an iris valve ring, as shown and described.